However, under contacts I see the Contacts of my local Personal folders, as I do see the Contacts of the secondary pst file. While for calendars I can explicitly set which calendar to display, for contacts I can only arrange the search order (move up / down).

How can I disable the search of contacts for the secondary data file? It is disturbing to get them displayed, e.g when searching for email. Basically I only have opened the file to have its emails available.